Morphology of male reproductive system and aspects of the reproductive behavior of Trypoxylon (Trypargilum) (Hymenoptera: Crabronidae) / Morfologia do sistema reprodutor masculino e aspectos do comportamento reprodutivo de Trypoxylon (Trypargilum) (Hymenoptera: Crabronidae)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Male reproductive tract of Trypoxylon (Trypargilum) has the basic pattern of Hymenoptera, with morphological variations that characterize the subgenus. It is formed by a pair of testicles, two deferent ducts and one ejaculatory duct. In each deferent duct there is an enlarged region, the seminal vesicle, with an accessory gland opening in the end of it. Each testicle has three follicles which have germ cells in all spermatogenesis stages, even in sexually matures individuals. Sperms are released from testicles in bundles with up to 32 cells. These bundles are gradually disorganized inside seminal vesicle, witch have a fold that we believe that play a role like a valve, dosing sperms released in each ejaculation. In T. lactitarse, mating occurs before each oviposition what can assure male paternity of most offspring in that nest, since spermatheca is practically vestigial in these females and then might disable sperm storage. Otherwise in T. nitidum mating is less common and there is sperm inside spermatheca, although it is a little amount. This suggests that there are differences in reproductive strategies between both species.

ASSUNTO(S)

wasps histologia histology morfologia trypoxylon spermatheca espermateca vespas esfeciformes

ACESSO AO ARTIGO

Documentos Relacionados